This is a list of Japanese football J1 League transfers in the winter transfer window 2017–18 by club.
Ventforet Kofu
In:
Out:
Albirex Niigata
In:
Out:
Omiya Ardija
In:
Out:
Avispa Fukuoka
In:
Out:
Tokyo Verdy
In:
Out:
JEF United Chiba
In:
Out:
Tokushima Vortis
In:
Out:
Matsumoto Yamaga
In:
Out:
Oita Trinita
In:
Out:
Yokohama FC
In:
Out:
Montedio Yamagata
In:
Out:
Kyoto Sanga
In:
Out:
Fagiano Okayama
In:
Out:
Mito HollyHock
In:
Out:
Ehime FC
In:
Out:
Machida Zelvia
In:
Out:
Zweigen Kanazawa
In:
Out:
FC Gifu
In:
Out:
Kamatamare Sanuki
In:
Out:
Renofa Yamaguchi
In:
Out:
Roasso Kumamoto
In:
Out:
Tochigi SC
In:
Out:
References